[NEW YORK] For airline passengers, rewards programmes may not seem so rewarding any more.

Two of the nation's largest airlines, United Airlines and Delta Air Lines, have announced that next year, frequent flyer points will be based on dollars spent on plane tickets rather than distance flown. And while another major carrier, American Airlines, has not announced any change, it is "watching the competitive environment", said Laura Nedbal, a spokeswoman.

Leisure travellers may feel as though they are on the losing side of the changes. Every policy change has winners and losers, and airlines maintain that they are simply catering to customers who generate the most profit.